Audio

Aici aveti la dispozitie 515 trimiteri catre pagini audio si scheme.

1. Analog Music Zone Guitar Effects Schematics - efecte pentru chitara, compresoare, efecte de microfoane
2. Andrea's projects - circuite si documentatie
3. Audio Designs Guide
4. Audio Electronic Design - circuit hi-fi in limba Franceza
5. Audio Electronics Page - apmplificatoare, preamplificatoare, surse de alimentare
6. ESP A- from ESP Audi Foarte multe proiecte audio
7. Pro Audio Equipment Schematics Page - Alan Garren's excellent listing of vintage gear schematics including API, UREI, Altec, RCA and more
8. The Do-It-Yourself Audio Corner - cum sa-ti faci boxe
9. 10 Watt IC Power Amp - realizat cu TDA2030
10. 20 Watt IC Power Amp - bazat pe LM1875
11. 1.5V AF Amplifier - un amplificator foarte micut alimentat de la o baterie de 1,5v
12. 22 Watt Audio Amplifier - amplificator stereo foarte simplu realizat cu TDA1554
13. 2 Watt Amplifier -amplificator cu distorsiuni foarte reduse realizat cu componente discrete
14. 8 Watt Audio Amp - bazat pe LM383
15. A HIFI class D audio power amplifier - The purpose of this site is to share a pulse-width modulating class D audio power amplifier design with the world, in order to involve people that have an interest in this kind of technology. This is in effect an "open source project", i.e. the design is open and free, and those that have the interest and ability, are encouraged to feed back back into the project.
16. Cheap 10 W amp - based on TDA2003 IC
17. Cheap thingies to help you make some racket - small amplifier circuits using many amplifier ICs, from few watts to 200W
18. DIY Class-A Audio Amp - Proiect cu amplificator de 15W in casa A
19. Emitter-follower-power-amplifier - amplificator de foarte mica putere si foarte simplu
20. Hiraga Le Classe A 20W
21. Hybrid Amplifier "Surt" - amplificator cu tuburi in calasa A
22. Lidström Improved ZEN i - Amplificator in calasa a cu FET
23. Low distortion audio amplifier - amplificator de 30w cu distorsiuni foarte reduse
24. Low Power Audio Amplifier - facut cu LM386
25. New Audio Amplifiers with Current Amplifier Outputs - principiul de functionare a unui amp de 10W , other designs up to 75W
26. Power amplifier has transient rail-to-rail swing - special common-drain MOSFET-based power op amp circuit
27. anken Hybrid Audio Power Amplifier Data - technical data and application circuits for 10-50W amplifiers
28. Simple Class A Amplifiers - a 10W design by J. L. Linsley Hood
29. The 2-Channel Power Amplifier: Design and Testing - 4W amplifier based on NTE 1606
30. The Pass Zen Amplifier - 10 Watts of Single-Stage Single-Ended Class A
31. Zen Revisited poweramp - 10 Watts of Single-Stage Single-Ended Class A solid-state amplifier
32. 100W RMS Amplifier
33. 100 W Amplifier
34. 120 Watt Vertärker - Amplificator de putere 120W
35. 200 Watt Lateral Mosfet Amplifier - general purpose symmetrical MOSFET design for power between 50 Watts to 200 Watts into 8 Ohms
36. 50 Watt Amplifier - amplificator usor de construit de 50 wati
37. 60 Watt Into 8 Ohms Power Amplifier - a simple amp to build, uses commonly available parts and is stable and reliable
38. 75W Power Amplifier - AKSA is a highly refined push pull solid state stereo amplifier of 75W per channel
39. Ampli MOSFET - DIY high power MOSFET amplifier 200 Wrms 8 ohms - 350 Wrms 4 ohms
40. Cheap thingies to help you make some racket - small amplifier circuits using many amplifier ICs, from few watts to 200W
41. El-Cheapo - Amplificator foarte simplu de 60W
42. N-Channel Power MOS- quasi complementary HEXFET N - Channel Power Amplifier that gives 260 Watts RMS into 8 Ohms and over 400 Watt RMS into 4 Ohms, check also N-Channel Amplif
43. New Audio Amplifiers - many amplifier and accessory circuits
44. New Audio Amplifiers with Current Amplifier Outputs - basic 10W design, other designs up to 75W
45. P400 hi-fi high end audio power amplifier - amplifier with 382W to 8 ohms power rating, can drive speakers at 2-16 ohms range
46. Pass Laboratories DIY Projects - mai multe proiecte de amplificatoare
47. Power amplifier subcircuit hoy the UHER CV-140 amplifier
48. SDS Labs Schematics - solid state class A amplifiers
49. Single Chip 50 Watt / 8 Ohm Power Amplifier - uses LM3876 hifi amplifier IC from National Semiconductor
50. Single Ended MOSFET Po- uses HEXFET "mosfet" transistors and develops over 50 Watts RMS into 8 Ohms, check also Suitable PSU for the SE Two Stage Power MOSFET Am
51. Symmetrical Output Amplifier - FET amplifier with power rating of 230 Watts RMS into 8 Ohms Per Channel and 400 Watts RMS into 4 Ohms Per Channel, first published in Silicon Chip Magazine in June 1994
52. The Leach Amp - 120W power amplifier, latest update of the "Low TIM Amplifier", claimed to be a very good sounding design
53. The Leach SuperAmp - 270 watt Double Barreled Amplifier published in Audio magazine
54. The LM12 - chip which can be uased ot make simple 80W amplifier
55. Professional has full circuit diagrams of some of their PA amplifiers in their technical pages, power ratings from 2x80W to
56. service manuals and circuit diagrams of some of their amplifiers
57. Renkus-Heinz Schematics
58. 20 Watt Power Amplifier - designed to be used as car amplifier
59. Car amplifier information and schematics
60. Car Amplifier Schematic
61. Car Audio Schematics - car amplifiers
62. Car tube pre amplifier
63. Do It Yourself - This article is for those who wants to make their own car amplifier. The basics of calculation will be discussed below. If you have understand it you will be able to make car amplifier based on article by Mr. T. Gi
64. Bridging Adaptor For Power Amplifiers
65. DIY Massive Heatsink Case - suitable for high power amplifier or class A power amplifier
66. Loudspeaker Protection and Muting
67. Loudspeaker Protection circuit - DC protection circuit
68. Power Follower with Dinamic Current Source by Reinhard Haffmann - less wasted power than true class A but not as good sound
69. Power Amplifier Clipping Indicator
70. Speaker protector
71. A DIY Headphone-Amplifier with Natu- check also An Enhanced-Bass Natural Crossfeed
72. An Acoustic Simulator for Headphone Amplifiers - a simple RC filter that creates a more realistic sound image in headphones by electronically mimicking spatial hearing with "shaded" interchannel crossfeed
73. Build These Noise-Canceling Headphones - plus Binaural Microphone Headset, Audio Probe, and Parabolic Microphone
74. Designing an Opamp Headphone Amplifier - mai multe exemple de amplificatoare
75. HeadBanger Headphone Amp Construction Kit
76. Headphone Amplifier - designed for Sega Megadrive, but can be used with other line level signal sources, Originally published in ETI, December 1994
77. Headphone Amplifier from SDS Labs - uses a push-pull Class A MOSFET output stage, being driven by an op-amp
78. HeadWize Projects - many headphone amplifiers and related circuit
79. Kumisa Mk. II - DIY headphone amplifier project using AD844 and some special transistors
80. SDS Labs Headphone Amp - solid state amplifier
82. Stereo - takes input from one audio power amplifier and drives many headphones vith adjustable audio level, available as a kit from
83. Top-Level OTL Tube Headphone Amplifier
84. HJ-4P Professional headphone distribution box - drives up to 4 headphones from a single amplifier, has volume control and mono switch, product datasheet with circuit diagram in pdf format
85. HJ-6 Standard headphone distribution box - drives up to 6 headphones from a single amplifier, product datasheet with circuit diagram in pdf format
86. 100W Guitar Amplifier
87. Cool Schematics - solid state and tube guitar amplifier circuits
88. ALL-FET MC- phono preamp with 54 and 64 dB gain and RIAA accuracy is better than 0.2dB, from Borbel
89. A Pocket Headphone Amplifie - portable headphone amplifier for testing purposes using Burr-Brown OPA132 opamp in a non-inverting configuration, powered with 9V battery
90. Audio Preamp - simple preamp for electric guitar or microphone
91. Bride of Zen preamp - a very simple line-level preamplifier which contains just one medium-power MOSfet per channel
92. Fender Pre-amp with Horizonal Tube Mounting
93. Hi-Fi Preamplifier
94. High quality preamp (STUDER)
95. Hiraga MC -Moving Coil förstärkare
96. IC Phono Stage Design
97. Kaneda Linjeförsteg - includes phono and line inputs
98. Mic-Pre Pan Pot Circuit
99. Simple Car Preamplifier and Artificial Earth
100. Simple Guitar Preamplifier
101. Power Amplifier Design Guidelines
102. Cool Audio - application notes on PWM amplifiers
103. LM12CL - very compact IC for making good quality 80W audio amplifier, this IC has been used in some high quality active loudspakers
104. 25L6 Amp - design without a power transformer
105. A hybrid amplifier using a 5687 tube and Magnatec PowerMosFets
106. Ampage - tube amps and music electronics
107. Aren's Attic Tube amplifiers - 1626 SE amplifier, ECL86 SE amplifier and tube links
108. Bob's Music/Vacuum Tube Audio / Electronics page - many amplifier circuits
109. Build a tube amplifier - articles from HiFi magazine (in Finnish)
110. Car tube pre amplifier
111. Dynaco Mark 3
112. Dynaco stereo 70
113. Experimental SE Pre-Amplifier - single-ended tube preamplifier
114. Klassiskt 300B slutsteg
115. Klaus Schiffer's audio web site - tube amplifiers and tube information
116. KTA/KSA High End Tube Audio - many tybe amplifier projects
117. Les projets en cours - tube amplifiers
118. Musical Instrument Tube Amp Building, Maintaining and Modifying FAQ
119. Pure A class - 15W pure A class and push-pull
120. SDS Labs Schematics - solid state class A amplifiers, headphone amplifier, vacuum tube amps
121. Sheldon's Audio Designs - audio DACs and tube amplifiers
122. Soft start for power tubes
123. The Preamplifier - tube amplifier that features relay input selector, µ-follower linestage, balanced RIAA amplifier, DC heater supplies, and shunt regulator for the RIAA power
124. Tube Guitar Amp
125. Tube Buffer for CD Player
126. Tube Line-Stage Design - pdf file
127. Tube Microphone Preamplifiers V72 (Telefunken/Siemens/Maihak/TAB) - information about the amplifier and the schematic
128. Vintage Quad equipment circuit diagrams
129. Quad 22 - circuit diagram of commercial tube amplifier
130. Zero Feedback Stereo Pre-Amplifier with Balanced & Unbalanced Inputs and Outputs
131. Phantom Power Supply Circuit - A power supply for adding 48 volt phantom power to microphone preamps
132. Regulated 12 Volts DC Power Supply for Vacuum Tube Heaters - this 7812 based circuit circuit can be used with low-hum audio applications such as microphone preamps and for other applications that require well regulated 12 volts
133. Regulated Vacuum Tube Power Supply - regulator de tensiune cu tuburi 250-300 VDC
134. 3 Line Mixer -very basic circuit built around one transistor
135. 6 Input Mixer - 3 intrari de linie si 3 intrari de microfon
136. Active audio mixer with pan-control - This circuit is the mixing part of an audio-mixer.
137. Advanced- good article on large audio mixer design, read also Noise & Headroom in
138. An Automatic MicropAudio mixer for Ramsey FM10 transmitter: description, schematic also in Postscript
139. Audio mikseri - simple three channel audio mixer, text in Finnish
140. High Quality Sound Mixer - very ambitious and expected to be very expensive mixer project, modular design
141. Microphone Mixer - designed for three dynamic microphones
142. Portable 20 Watt Mixer/Amplifier - portable amplifier and mixer which will run from a standard 12V battery and liven up any outdoor event
143. Simple 4-input mixer
144. Simple audio mixer for two signal sources
145. Simple audio mixer design ideas
146. Single capacitor powers audio mixer - micropower and low-voltage op amps allow you to build high-performance analog-signal processors that require no batteries or wall transformers, this simple mixer is powered using one large capacitor such as a Supercap or Dynacap for some time
147. Stage and Recording Mixer - full featured modular mixer design
148. Stereo Mixer - can mix four separate audio inputs to one mono or stereo output signal
149. A Two-Channel Noise Gate
150. An Unbalanced Mute Circuit For Audio Mixing Channels - schema de utilizare in format PDF
151. A New Balanced Audio Input Circuit for Maximum Common-Mode Rejection in Real World Environments - 109KB PDF file
152. Audio Transformers - notes on using audio transformers for balanced signal interfacing
153. Additional RFI Protection for Line Input Circuits - 8KB PDF
154. External Isolation Transformer Box for Mackie (and other) Mixers Eliminates RFI Problems
155. High CMRR Balanced Interface for Crystal 18 or 20 Bit A/D Converters - pdf file
156. Internal Modification to Mic Inputs of the Mackie 1604 Mixer Eliminates RFI Problems
157. Instrumentation or true balanced input differential amplifier
158. JT-6110K-B at Input Stage for Crystal A to D Converters - high performance transformer balanced input stage for Crystal A/D converters, pdf file
159. JT-11P-1 Balanced Tube Line Input Stage
160. JT-11SSP-6M as Input Transformer for Crystal CS5367 A/D Converter - transformer balanced passive input circuit for CS5367 A/D converter, pdf file
161. JT-16-A Improves Performance of SSM2015 Mic Preamp IC
162. JT-16-A Improves Performance of SSM2017 Mic Preamp IC
163. JT-MB-C in Low Noise, High Isolation Line Receiver for Low-Z Sources
164. JP-11P-1 Input transformer improvement for electronically balanced input
165. Jensen Transformers Application Schematics - many circuit examples with transformers
166. JT-MB-C Isolates both Mic and Line Inputs of Inexpensive Mixer
167. JT-MB-C Mic Input Isolation for Mackie Mixers
168. JT-MB-C "Real" Mic Inputs & Phantom Power for Sony DAT
169. Making Differential Probes - for sensing audio signal voltages across devices which are not ground referenced
170. Simple differential amplifier - opamp balanced input circuit with unity gain and common mode rejection adjust
171. Subtleties count in wide-dynamic-range anal- article on balanced input designing with some example circuit topologies, article from EDN m
172. 12 dB Amplifier and High Current Line Driver with DC Servo
173. 20 dB Amplifier and High Current Balanced Line Driver
174. High Output Line Driver for Single Ended Power Supply - pdf file
175. JT-11-BM High Level Differential IC Output Stage with DC Servo
176. JT-11-BM High Level High Current Differential Output Stage with DC Servo
177. JT-123-S Line Driver with Feedback Around the Transformer
178. JT-123-BL High Level Low Impedance Differential Output Stage with DC Servo
179. Low Noise version of High Level Output Stage in 1031 - pdf file
180. Mixed feedback drive circuits for audio output transformers - using feedback eliminates transformer distortion and primary resistance
181. Non-inverting amplifier - opamp circuit which provides 15 dB gain and option for balanced output
182. Simple 0 to 24 dB Gain Amplifier and Balanced Line Driver - 18KB PDF
183. Balancing Acts - balanced and unblanced interface circuits using tubes
184. Balanced Line Driver & Receiver
185. Balanced Line Inputs/Outputs for Silicon Graphics Workstations - balancing using transformers
186. Balanced Line Technology - information article and example circuits for both input and output
187. Bridging Line Amplifier - transformer balanced input and output with amplifier in between
188. Transfomers for audio interfacing - discussion on using audiop transformers in equipment interconnections, read also
189. Line-level transformers in High-End Audio
190. Zero Feedback Stereo Pre-Amplifier with Balanced & Unbalanced Inputs and Outputs - tube circuit
191. Grounding and shielding in balanced inputs and outputs which are transformer coupled
192. JT-11-YZPC in Unbalanced Long Line Driver/Isolator
193. Long Lines Driver - high current output configuration is ideal for use as a transformerless long lines driver
194. Black Box Circuit - a 40dB pad/100:1 attenuator for running spaker output to DI-box, so if you put 100 Watts in you'll get around 275 mVolts out
195. AV-1 Tech Sheet (Direct box,) - DI-box product datasheet which includes full circuit diagram, has line level and speaker level inputs, pdf file
196. AV-1PV Tech Sheet - DI-box with line level and speaker level inputs, with input volume control, data sheet with circuit diagram, pdf file
197. CB-1 Direct Box - unixersal DI-box product which works with guitar and keyboards, product datasheet with circuit diagram in pdf format
198. DB-1 Direct Box - DI-box with instrument and speaker level inputs, product datasheet with circuit diagram in pdf format
199. DB-4 Direct Box - four channel DI-box with keyboard or dum machnine inputs, product datasheet with circuit diagram in pdf format
200. Direct Injection Box for Recording & PA Systems - passive and active DI-box designs
201. Jensen Direct Box Transformers - data sheets have example circuit diagrams
202. JT-DB-E Standard Musical Instrument or Synthesizer "Direct Box"
203. JT-10KB-D Isolates and Converts Speaker Drive to Line Level
204. JT-11-FL provides Isolated Line Output from Guitar Amplifier
205. JT-11-FL Isolates & Converts Guitar Amp Speaker Out to Line Output
206. JT-11P-1 Conversion of Unbalanced Input to Balanced
207. JT-DB-E Full-featured "Direct Box" Application Schematic
208. JT-DB-E "Direct Box" for Very High Level Signals - takes high level line signal and outputs balanced microphone level signal
209. JT-DB-E Standard Musical Instrument or Synthesizer "Direct Box"
210. PO-26 Passi- circuit diagram of Sescom PO
211. Direct Injection Box for Recording & PA Systems - passive and active DI-box designs
212. Electric Crayons, Anyone? (A Vacuum Tube Microphone Preamp / Direct Box Project) - published in January97 EQ Column
213. Mike Pads and Other Small Gadgets - includes Active Direct Box circuit
214. JT-11B-1 + "Phantom" Buffer Provide Balanced Guitar Output
215. JT-11P-1 in 4-Way Active "Guitar Splitter" - from one guitar to up to 4 guitar amplifiers
216. JT-10B-D Used in Line Level 2-Way Splitter/Isolator - active line level splitter circuit with input and output isolation
217. JT-11P-1 in 2-Way Passive "Guitar Splitter" - from one guitar to two guitar amplifiers
218. MS-2 Mic Splitter - send signal from one microphone to two mixers, product datasheet with circuit diagram in pdf format
219. MS-82P Microphone Splitter with Phantom Power Buss - 8 channel microphone splitter which can inject phantom power to microphone, product datasheet with circuit diagram in pdf format
220. PO-25 Kit 1 x 3- circuit diagram of Sescom PO
221. Theory and Construction of Mic "Splitters" - 5 page booklet in pdf format
222. Transformer Coupled Splitter - active amplified transformer isolated signal splitter that enables hum-free connection of one guitar to more than one amp as well as having a direct output
223. IT-1 Inline 600/600 ohm line transformer - audio signal isolation transformer, product datasheet with circuit diagram in pdf format
224. IT-4 four channel isolation transformer unit - audio signal isolation transformer, product datasheet with circuit diagram in pdf format
225. JT-11-DM Basic Hum Stopper Transformer isolation box - simple isolator for 600 ohm balanced audio lines
226. JT-11P-1 Unbalanced Automotive or Consumer Application - isolation transformer box for unbalanced consumer audio line signals
227. JT-11P-1 Conversion of Unbalanced Input to Balanced
228. JS-11SSP-6M 150 ohm line to 600 ohm load application - isolation transformer with impednace conversion
229. JT-11SSP-6M 600 Ohm Line Isolation Application - isolation transformer for 600 ohm balanced audio line
230. JS-11SPP-6M 600 ohm line isolator with line termination switch - for used with long 600 ohm lines which need termination
231. JT-11SSP-6M Universal Patchbay Isolation Application - for use with professional low impedance sources and high impedance loads
232. Dual JT-MB-C Microphone Combining Circuit - connect two microphones to one microphone input
233. JT-11SSP-6M Passive Stereo Matrix for M-S Mic Technique
234. MC-2 Microphone Combiner - product datasheet with circuit diagram in pdf format
235. Simple line mixer - mix two line level sources to one signal, includes separate volume controls for both signals, passive circuit
236. Simple two line output combiner - convert consumer equipment stereo signal to mono or combine audio signal from two different equipments to one input
237. Stereo to Mono Combiner for Balanced Systems
238. Interconnection of Balanced and Unbalanced Equipment - 4 page booklet in pdf format
239. JT-10KB-D & JT-DB-E Provide "J-Box" Consumer to Studio Interfaces - from -10dBV unbalanced to 150 ohm balanced microphone level (-45dBu) signal and from +4dBu balanced signal to -10dBV unbalanced signal
240. JT-10KB-D & JT-6110K-B "Pro" to "Consumer" Interfaces - from +4dBu balanced output to -10dbV consumer equipment input
241. Audio Transformer: The Ultimate Noise Killers - application note article on audio transformers
242. Grounding and Shielding - describes basic audio transformer uses like balanced in/out and signal splitters
243. Internal Modification to Mic Inputs of the Mackie 1604 Mixer Eliminates RFI Problems - adding transformer isolation increases common mode rejection and eliminates RF interference, pdf document
244. Jensen Transformers Application Schematics
245. JT-11P-1 as "Phase Splitter" with Symmetrical Outputs
246. JT-10KB-D Isolates and Converts Speaker Drive to Line Level
247. JT-11P-1 used as Unbalanced Polarity Inverter
248. JT-11-DM Converts Unbalanced Output to Balanced
249. JT-11SSP-6M Bi-directional Lo-Z Long Line Application - this circuit isolated and impedance matches under 100 ohm source to long cable line and that to over 10 kohm input
250. JT-6110K-B Isolates "70 Volt" Line and Converts to Line Level
251. JT-DB-E Converts Consumer Stereo Inputs to Mono Balanced Mic Output
252. JT-MB-C Isolates both Mic and Line Inputs of Inexpensive Mixer
253. JT-MB-C "Real" Mic Inputs & Phantom Power for Sony DAT
254. JT-MB-C Mic Input Isolation for Mackie Mixers
255. JT-MB-D Converts 600 Ohm Unbalanced Mic to 150 Ohm Balanced Mic Line
256. Mixed feedback drive circuits for audio output- technical paper from Lundahl Transformers in pdf
257. 2-wire Remot Microph- uses special amplifier module from Opa
258. Amplified Ear - Useful to listen in faint sounds 1.5V Battery operation, includes electret microphone preamplifier which runs from 1.5V DC and can directly drive 32 Ohms impedance mini-earphones
259. Audio preamplifier circuits - three transistor microphone preamplifiers
260. A Vacuum Tube Microphone Preamp / Direc- from January 1997 EQ Column, includes phantom power
261. Balanced mic/line amp with TUBES - uses two 12AU7 tubes in a class-A cathode-driven input stage, followed by a class-AB1 cathode follower output stage, 6db gain, requires 90VDC and 12VDC
262. Balanced Mic Preamp - based on SSM2017 and has option for 48V phantom power
263. Balanced Microphone Preamp Project - simple preamplifier with phantom power
264. Condenser microphone hookup
266. DIY Speaker Testing Microphone Preamp
267. Dual Phantom Power Microphone- information and full schematic of a kit available from PAiA Electronics, take also look at the circuit
268. ECM Mic Preamplifier - low noise electret microphone preamplifier
269. Electric Crayons, Anyone? (A Vacuum Tube Microphone Preamp / Direct Box Project) - published in January97 EQ Column
270. IC mic preamp uses Jensen Twin-Servo topology
271. Intercom preamp - a convenient way of making an intercom is to use a loudspeaker as a microphone
272. Jensen Transformers Application Schematics - includes many microphone preamplifier related circuits
273. JT-13K6-C in Simple One IC Stage Mic Preamp - 15KB PDF
274. Kondensaattorimikrofonin esivahvistin - simple preamplifier for electret microphone, text in Finnish
275. Low Noise Balanced Microphone Preamp - very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot, similar to that used in many professional grade mixing desks
276. Low Noise Microphone Preamplifier
277. Mic-Pre Pan Pot Circuit
278. Microphone preamp - very simple two transistor circuit
279. Microphone Preamplifier by Jason M. Neal - suitable for speaker measurements
280. Modern Microphone Preamplifiers - A paper originally published in R-E-P Magazine, contains general information but does not contain circuit diagrams
281. Mu Stage Tube Mic Pre - microphone preamp based on a Jensen transformer and an Alan Kimmel designed "Mu-mode" gain stage
282. PAiA Tube Mic Preamp
283. Simple microphone preamplifier - amplificator simplu cu un tranzistor
284. Simple Transistor Audio Preamplifier - for electret microphone
285. Standard Microphone Preamplifier Input Circuitry - pdf file
286. Taos Amp Solid State Mic Preamp - simple transformerless microphone preamp, includes circuit board design
287. Vintage Neve Class A Circuit Information - Neve BA283AV Class A Preamaplifier Circuit
288. Boundary-layer dish microphone - ideas for a directional microphone assembly
289. Build a pair of binaural microphones
290. Build These Noise-Canceling Headphones - plus Binaural Microphone Headset, Audio Probe, and Parabolic Microphone
291. Computer Microphone - adapting electret microphone to soundcards with dynamic microphone inputs
292. DAT-Heads Digest #195 - many electret microphone wiring tips
293. DIY microphone for Sony MD R35 minidisc recorder - simple electret microphone
294. Electret MIC Apps - an electret MIC is the best value for money omnidirectional microphone you can buy for 90% of microphone application
295. Electret microphone connection - how to connect electret microphone
296. Electret microphone powering circuits
297. Homemade Binaural Mics
298. Inductive pickup - simple device for detecting audio-frequency electromagnetic signals, such as those emanating from a loudspeaker, or it's cable
299. Interfacing Microphones to Computer Sound Cards
300. JT-MB-D Passive Stereo Matrix for M-S Mic Technique
301. JT-MB-C Used to "Phantom" Power the Realistic PZM Mic
302. Making a rugged, connectorized microphone from a Panasonic microphone capsule
303. Radio Shack Pressure Zone Microphone (PZM) Modifications
304. Schematics of old tube mics
305. Speaker Microphone - allows you to use a cheap loudspeaker as a poor microphone
306. Taos Amp Stereo Bar - how to build special microphone holder for two microphones for near coincident stereo techniques
307. Telefunken (Neumann) U47 FET Retrofit - inlocuirea tuburilor cu tranzistoare FET
308. Couch Drop: Momentary on/off floor switch for microphones - data sheet with circuit diagram in pdf format, includes no-pop mute function
309. Phantom Power Supply Circuit - Here is a simple phantom power supply that uses a voltage doubler circuit so that a commonly available low voltage transformer (such as a Radio Shack 273-1366A) can be used to produce 48 to 52 Volts DC.
310. Hi-Fi Preamplifier
311. Phono Preamp - realizat cu tuburi
312. Phono Preamps For All - a collection of phono preamps and equalisation circuits, one of which is sure to meet your requirements
313. Preamps (phono RIAA) - 10 RIAA preamplifier schematics
314. QSX Mark II - The extreme phono (RIAA) amplifier
315. The ampage schematic collection - guitar and bass preamplifiers
316. A Better Volume Control - how to create a log pot that is better than the "real" thing
317. Add-On Stereo Channel Selector - electronic switcher for 4 stereo sound channels
318. CMOS IC makes low-cost digital potentiometer
319. Digitally control gain over a ±40-dB range - digitally control an amplifier's gain over a ±40-dB range gain resolution of 1.25 dB
320. Digital stereo potentiometer - in pdf format, text in Finnish
321. Digital Volume Control - based on DS1669 Digital Pot IC
322. Dual-Channel Digital Volume Control - this circuit could be used for re-placing your manual volume control in a stereo amplifier
323. Elektroninrn potentiometri - Potentiometru electronic cu push butoane, text in Finnish
324. Inexpensive relays form digital potentiometer - build a digitally controllable isolated potentiometer which can tolerate voltages up to 60V dc
325. Linear potentiometer implements logarithmic gain control - trimmer potentiometers are ubiquitous components and are available in a variety of packages, resolutions, and temperature stabilities but none of these potentiometers implements anything but the usual linear function of resistance vs shaft position as useful in many audio applications
326. Single stage gives logarithmic gain steps - by placing a variable component in the positive feedback loop of an op amp, you can vary the gain of the stage logarithmically with respect to a linear resistance or conductance
327. Tack a log taper onto a digital potentiometer - idea to convert linear digital potentiometer to a logarithmic digital potentiometer
328. Variable-gain stage uses voltage-output DAC
329. Voltage controlled amplifier - three different circuits
330. Voltage Controlled Audio Panner - variable gain amplifier circuit
331. Voltage-controlled stereo signal attenuator
332. 10 band audio equalizer - ascii drawing of simple circuit
333. Adjustable 60Hz Filter - to filter out any HUM that may be picked up by a noisy power supply or long wire connection
334. "A" Weighting Filter For Audio Measurements - design based on an old Ampex circuit
335. 3 KHz low pass filter plus audio amplifier - circuit uses a switched capacitor filter IC MF6-50 from National Semiconductor to filter signals with frequencies higher than the 3KHz needed for voice audio, pdf file
336. Basic Active Filter Circuit Blocks
337. Five Band Mono Graphic Equaliser - basic mono unit originally designed for improving the apparent sound quality when dubbing video
338. A Basic Introduction to Filters - application note on active, passive and switched capacitor filters, document in PDF format
339. Active Filters - Butterworth, Bessel and Linkwitz filter example circuits and equations
340. Audio Graphic Equaliser - simple 7 band equalizer
341. Basic gyrator design - basic building block of graphic EQ
342. Designing A Pocket Equalizer For Headphone Listening
343. Filters - examples of very many different filter types, good page for filter design information
344. Have Ya Ever Been Too High?? - filter that is intended to take the harshness off some sources of sound that have an upward response tilt, go to the end of page to find this circuit
345. applicati
346. Multiple Feedback Bandpass Filter
347. Musical Instrument (Expandable) Graphic Equaliser - standard equalizer plus bonus distortion unit
348. Notch Filter
349. Parametric And Sub-Woofer Equaliser - simple parametric equalizer circuit
350. Tone Control Circuit - classic Baxendall tone control circuit
351. Tone Control - based on TDA1524A tone control IC
352. Tone controls wi- check also
353. 24db/octave Linkwitz-Riley
354. 3-way 4th Order Active Crossovers for Car Audio
355. A 2nd Order All-Pass 80Hz Active Crossover
356. Hifi 100/1 aktiivi alipäästösuodin - modified version of Hifi 100/1, only lowpass filter section, text in Finnish
357. High Pass Filter - second order active low-pass filter with equation to calculate component values for different frequencies
358. Low Pass Filter - second orrder active low-pass filter with equation to calculate component values for different frequencies
359. Renkus-Heinz Schematics - includes some crossover and speaker controller schematics
360. Schematics Of Various Tubed Crossovers
361. Subwoofer filter - 12 dB/octave low pass filter for subwoofer, includes subsonic filter
362. Audio Amp Output Power Limiter
363. Audio level control device - compressor circuit based on LED and photodiode
364. Compressor using photoresistor - very basic circuit based on LED, LDR and OPAMP
365. Designing A Limiter For Headpho- review of diode-based limiter design, HeadWize Desig
366. Dynamic Range Processor - this stereo unit allows the dynamic range of a signal to be increased (expansion) or decreased (compression) by a variable amount up to 3:1, based on the SSM2120 dynamic range processor IC
367. Fast Audio Peak Limiter
368. Q&D Compressor - A complete guitar compressor/limiter design based on SSM2165
369. Q&D Compressor 2 - based on SSM2166
370. Stereo Broadcast Limiter Circuit for the Ramsey FM10a/FM2- also available in Postscript
371. Stereo Compressor
372. Teletronix LA-2A Leveling Amplifier - a vacuum tube-type leveling amplifier (more commonly known today as a compressor) for professional audio recording and broadcasting use originally made during the mid to late 1960s
373. Ultra Simple Bass Guitar Compressor - based on LDR connected to signal cable and lamp connected to speaker output
374. Analog Music Zone Guitar Effects Schematics - guitar effects, compressors
375. Digital Echo Unit - mono unit for producing special effects for amateur dramatics
376. Distortion Effect (for guitars) - three distortion circuit ideas
377. Distortion effect for guitars
378. Effect Rack Unit - contains very many guitar effect unit circuit diagrams
379. Effectronics Schematics - audio processing and effect circuits
380. Guitar Amplifiers Overdrive & Distortion Effect Circuits
381. Guitar Effects Boxes - guitar effect schematics and articles
382. Guitar Effec Circuits - Wah, Fuzz and sustain circuits
383. Guitar Fuzz Effect - very compact circuit
384. Guitar Reverb Pedal - circuit for a guitar spring reverb pedal, it has dry, wet, and drive controls for a wide variety of sounds
385. Guitar-related Circuits - effect circuit collection
386. Guitar Vibrato Unit
387. Ha- contains effect information, schematics and constructi
388. Humbucking & Noise-Reducing Electronics for guitars
389. Improving a guitar - information on rewiring an electric guitar
390. MOS Doubler - clean sounding version of an octave up, uses CMOS logic
391. Musical Instrument (Expandable) Graphic Equaliser - standard equalizer plus bonus distortion unit
392. Not Just Another Headphone Amp - battery-powered musician's practice and monitoring amplifier for guitar
393. Spring Reverb Unit For Guitar
394. Stage Center Reverb Unit - simple spring reverb unit
395. The GEO-Fex collection of vintage and new-design effects and musical related DIY
396. The Guitar Effects Oriented Web Page - FAQs and circuit diagrams
397. Vox AC30 Guitar Amplifier Simulator
398. CD Buddy - Karioke device
400. How to filter out voice in music - very simple method
401. The Truth About Vocal Eliminators - sometimes a vocal can be removed almost completely, but just as often the results are disappointing, just information without circuit diagrams
402. Build A Stereo Synthesizer - different frequency ranges appear at the two outputs, depending on the setting of the controls and create a stereo effect
403. Burwen audio processor documentation - dynamic noise filter and eliminator circuit diagrams
404. Digital Potentiome- information about digitally-controlled solid-state electronic potentiometers from Dallas Semico
405. Dynamic Noise Reduction Circuit - reducator dinamic de zgomot
406. Mixed feedback drive circuits for audio output- technical paper from Lundahl Transformers in pdf
407. Square wave to sine wave converter circuit
408. Stereo Width Controllers - vary the width of the "sound stage" when listening to stereo recordings
409. Synthfool - many musical instrument and effect circuit diagrams
410. Simple Surround Sound Decoder - three simple surround decoder circuit ideas
411. Surround Sound Decoder MK1 - designed to extract the rear channel from Dolby-encoded film soundtracks, very simple design
412. Surround Sound Decoder Mk2 - fully featured surround decoder
413. The PTI SD-PL1 surround sound decoder - This circuit takes a stereo audio input from any true stereo source and outputs 4- or 5- speaker surround sound. The effect sounds ridiculously similar to Dolby ProLogic.
414. Andrew's S/PDIF Stuff - S/PDIF converter circuits
415. CD-ROM to MD - get toslink signal from your CD-ROM drive
416. Cheap TOSLINK Transmitter
417. Coax Digital Out to MD - Convert the coax signals to TTL signals for Toslink module
418. Coax to TTL conv- check also circuit board
419. Optical output for Creative Infra CD-ROM - little circuit to connect your MD or DAT to your CD-ROM drive with standard optical S/PDIF cable, based on TOTX173
420. SPDIF Circuits - input and output interfacing circuits
421. S/P-DIF I/O Using the Epoch SoundPro HT-1869V+ Card - circuits for S/PDIF to TTL interface and TTL to S/PDIF coax
422. SPDIF RCA to (Optical + RCA) Adapter
423. S/PDIF to TOSLINK
424. TTL to Toslink converter circuit
425. A SCMS k- should work with all DAT decks that have a Sony CXD2601 signal processor, published in September 1992 in "Stereoplay", also available at ftp://ftp.cs.ruu.nl/pub/MIDI/DOC/pbsc
426. Copybit deleter - sets the copybit in digital audio signals to enable copying of digital recordings
427. Audio Crafters Guild Articles & Essays - DAC building articles
428. JT-DAC No. 3
429. SDS Labs DAC Page
430. CS8420 is asynchronous sample rate converter c- includes example circuits, pdf file, check also evaluation board
431. CDplayer's Project - information to make and upgrade a CDPlayer at home
432. CrystalClear AC'97 AMR Audio Modem Riser card reference design
433. Digital Delay Unit For Surround Sound
434. Passive circuit monitors AES data - you can display the data waveform on an oscilloscope easily with this circuit
435. -30dBm to +30dBm Audi- circuit with balanced input and adjustable gain to drive needle type VU meter, uses special amplifier module from Opa
436. Audio LED VU meter - built around discrete components
437. Audio Millivoltmeter
438. Audio Output Level Meter - This unit is designed for monitoring the audio output level across a loudspeaker when carrying out alignment of radios.
439. LED Audio VU Meter - logarithmic scale with 3 dB steps, based in LM3915 IC
440. LM3916N bar graph driver - datasheet in pdf format, drives a 10 LED bar graph with VU proportions (3dB/step)
441. Medidor de Señal de Audio (VUmetro) - Vumeter circuit, schematic and PCB. Text in spanish.
442. Peak Reading Audio Level Meter - indicates peak audio response on an analogue meter, similar to a tape recorder recording level meter
443. Peak Reading Level Meter Using Indicator Tubes
444. Sound Level Meter - one chip replacement for the standard analog meters, based on LM3915 audio level IC
445. Stereo VU Meter - A simple, low cost stereo VU meter that uses two LM3915 dot/bar display driver ICs to drive 2 rows of 10 LEDs moving bar display, pdf file
446. Three-Level Audio Power Indicator - Battery-operated 3 LED display that connect it to loudspeaker output
447. Understanding Peak-Reading Meters - includes one example circuit diagram
448. VU And PPM Audio Metering - circuits using analugue needle meters
449. VU Meter - 5 led VU meter, in pdf format, includes circuit board, text in Finnish
450. VU Meter Amplifier
451. VU Stereo Meter - will indicate the volume level of the audio going to your speakers by lighting up LEDs, based on LM3915 IC
452. Room Noise Detector - One LED monitors three levels: 50, 70 & 85 dB
453. A-weighting filter
454. A Weighting Filter For Audio Measurements
455. A-B Switch Box For Amplifier Comparisons
456. Build a Microphone Polarity Tester
457. Building the L-R Test Set - helps you to set up left/right channel balance on audio broadcasting ystems
458. Linkwitz Cosine Burst Generator - part of speaker measurement set described in the construction article
459. Microphone Circuit Test Oscillator - tone generator for testing XLR microphone lines
460. The ESP SIM (Sound Impairment Monitor) - a method of determining just how much your amplifier modifies the original signal
461. Distortion Analyser - filters needed in distortion measutements
462. Distortion measurement circuit
463. Power Amplifier Clipping Indicator
464. Pre-Distortion Techniques: Build a Tape Linearizer and a Distortion Analyzer
465. Self Oscillating Amplifier for Distortion Testing - allows the home constructor to make quite accurate measurements, without having to spend a lot of money on a low distortion oscillator
466. DIY Speaker Testing Microphone Preamp
467. Measuring Input and Output Impedance - input or output impedance of any two terminal network or electronic equipment can be determined by measuring the small signal ac currents and voltages
468. Simplified Measurement of Output Impedance - suitable for measuring audio circuits
469. Spectrum Analyzer and Equalizer Designs - for audio frequencies, article first appeared in the February 1982 issue of Recording-engineer/producer magazine
470. Burwen TNE7000 Transient Noise Eliminator - Schematics and Lineup Instructions
471. Burwen DNF1201A Dynamic Noise Filter - Schematics and Lineup Instructions
472. Laser Link Communicator - audio transmission up to few hundred meters
473. A Better Volume Control - use linear potentiometer and one tran resistor to make almost logarithmic response curve
474. Amplifier Thermal Protection and Shutdown Circuit
475. Amplifier Timer - Turns-off your amplifier when idle for 15 minutes, fed by amplifier tape-output
476. Ask the Applicat- a collection of articles from its "Analog Dialog" newsletter in pdf format from Analogue Devices, useful info for people designing aDC and DAC
477. Audio Auto Shutoff - purpose of this circuit is to automatically turn off any device plugged into its power outlets after a certain period of time of silence
478. Class A Amplifier Design
479. Determining Output Transformer Impedance - When replacing the audio output transformer on a radio, the replacement should match the impedance of the original as close as possible
480. DIY class A amplifier chassis & massive heatsink
481. Dual +/- 15 volt power supply - suitabe for powering many opamp circuits
482. George Krilov audio schematics page - page is about transistor audio power amplifiers, contains articles about power amplifiers shematics, design, construction and SPICE simulation, page is partially in English and partially in Russian
483. Guitar Effects FAQ
484. Jensen Transformers Application Schematics - many practical circuit ideas using audio transformers
485. JT-115K-E90 "Sync" Conversion for Magna-Tech 69C Repro Amplifier - sync track tape head preamplifier
486. Load Sensing Automatic Switch - apply power to the entire audio system by turning on one item, simple circuit
487. Loudspeaker Protection and Muting - information and circuits
488. Low Noise Audio Input Stage - idea for audio input stage for magnetic pickup or microphone using three transistors from Zetex, design note in pdf format
489. Main principles of amplifier wiring - how to wire operational amplifier circuits
490. Mixed feedback drive circuits dor audio output transformers - using feedback eliminates transformer distortion and primary resistance
491. Mosfet Power Amplifiers - A discussion of the benefits of the lateral Mosfet output devices used in todays High Power audio amplifiers
492. NE555 drives a speakes: Pulse Width Modulation Amplifier
493. Philips SAA1099 Sound Generator
494. Proper Grounding Inside Equipment Avoids Ground Noise Coupling (aka"Pin 1 Problems") - 15KB PD
495. Pushing the Limits of Audio Power Amplifiers
496. Removing the "DC Thump" from Audio Circuits
497. Signal Detecting Auto Power-On Unit - switches on relay when detects sound input
498. Sheldon's Audio Designs - audio DACs and tube amplifiers
499. Simplest Ever Amplifier Bridging - a design for a simple add-on bridging adapter for stereo power amplifiers
500. Simulation Electronique SPICE - some hifi circuits and simulation of them using SPICE, text in French
501. Soft-Start Circuit For Power Amps - redusces the current spike large transformers take when switched on
502. Subtleties count in wide-dynamic-range analog interfaces - transporting high-dynamic-range analog signals from one piece of equipment to another is not a trivial task, this article gives some help to it
503. The ALTMANN "SPLIF" Amplifier Topology - something about how to get some of the feedback out of our HIFI amplifiers
504. Thermo-Fan To Keep Your Amp Cool - fan controller which controls fan based on temperature
505. Variable Amplifier Impedance - idea of being able to vary the output impedance of a power amplifier
506. Andrea Ciuffoli Document Page
507. "Anti-RIAA" Equalizer for Line to Mag Phono Converter
508. Infrared Cordless Headphone -Proiect de cost redus pentru a reproduce sonorul prin infrarosii
509. JT-11P-1 used as Unbalanced Polarity Inverter - transformator pasiv bazat pe inversor audio de curent
510. JT-11P-1 Unbalanced Automotive or Consumer Application
511. Model Train Diesel & Horn Sound Module
512. Cirrus Logic Consumer & Professional Audio ICs - linkuri spre produse si documentatie
513. Cirrus Logic CS4334/35/36/37/38/39: 8-Pin, 24-Bit, 96 kHz Stereo D/A Converters
514. TDA1387T; Stereo Continuous Calibration DAC (CC-DAC)
515. CS3310: Stereo Digital V- from Cirrus Logic, verifica si IC datasheet
516. DS1267 Dual Digital Potentiometer - form Dallas Semicondictor
517. Analog record and playback IC's - raport studentesc
518. CS8401A/2A: Digital Audio Transmitt